Theory of approximate methods and their application to the numerical solution of singular integral equations  
Ivanov, Viktor Vladimirovich, 
 - Leyden :  Noordhoff International Publishing,  1976 
 - xvii, 330 p. ;  24 cm. 
<br/><br/> Translation of Teorii︠a︡ priblizhennykh metodov. | Includes indexes. 
<br/><br/><label>ISBN: </label>9028600361 :